Question

我用线程创建了一个应用程序（这是我的第一个线程应用程序）
我有一个WPF，按下按钮将打开一个excel拿到ProductID并在网站上搜索并返回一些细节，如果它存在
我已经创建并且工作正常。
但在UI中我想显示一个进度条和我正在搜索的当前产品所以我尝试使用线程即便在此之后，我的用户界面仍在冻有人可以帮我这里了
这是我在WPF中点击的代码

private void btnSubmt_Click(object sender, RoutedEventArgs e)
    {
        ValidateWork obj = new ValidateWork();
        obj.notifyCompleteEvent += new EventHandler(obj_notifyCompleteEvent);
        obj.updateUI += new EventHandler<NotifyEventArgs>(obj_updateUI);

        if (string.IsNullOrEmpty(TxtbxFlePth.Text))
        {
            MessageBox.Show("Please Select a Excel File to Validate");
            return;
        }
        Excel.Application exclCrtApp = new Excel.Application();
        Excel.Workbook exclWrkBuk = exclCrtApp.Workbooks.Open(TxtbxFlePth.Text, ReadOnly: true);
        Excel.Worksheet exclWrkSht =( Excel.Worksheet) exclWrkBuk.Worksheets[1];
        PrgrsBar.Maximum = exclWrkSht.Range[exclWrkSht.Range["A2"], exclWrkSht.Range["A1048576"].End[Excel.XlDirection.xlUp]].Rows.Count;
        obj.fnStrt(exclWrkSht);

        string strSaveName = exclWrkBuk.FullName.ToString();
        strSaveName = strSaveName.Substring(0, strSaveName.IndexOf(".xls"));
        exclCrtApp.DisplayAlerts = false;
        exclWrkBuk.SaveAs(strSaveName+"_output.xlsx");
        exclWrkBuk.Close(false);
        exclCrtApp.DisplayAlerts = true;
        exclCrtApp.Quit();
        exclCrtApp = null;
    }

这是我的班级，有踩踏，并完成所有工作

class ValidateWork
{
    bool blnBrwRedy = false;
    public event EventHandler notifyCompleteEvent;      //event hander to notify the completion
    public event EventHandler<NotifyEventArgs> updateUI;    //event handler to notify UI for progress

    ManualResetEvent resumeUI = new ManualResetEvent(false);
    //first program the click calls
    public void fnStrt(Excel.Worksheet exclWksPass) 
    {
        Thread Trailtrd = new Thread(() => fnValidate(exclWksPass));            
        Trailtrd.SetApartmentState(ApartmentState.STA);
        Trailtrd.Name = "classfuncallthread";
        Trailtrd.Start();
        resumeUI.WaitOne();            
    }

    //worker thread
    public void fnValidate(Excel.Worksheet exclWksPass)
    {
        Excel.Range exclRngManHdr, exclRngCrtRow, exclRngOutUrl,exclRngAllPrd;
        string strGoglLnk = "https://www.newark.co.in/search?q=";
        StringBuilder strbldSrcRes = new StringBuilder();
        byte[] bytBuffResp=new byte[8192];
        string[] strResltUrl=new string[4];

        exclRngManHdr = exclWksPass.Range[exclWksPass.Range["A1"], exclWksPass.Range["VI1"].End[Excel.XlDirection.xlToLeft]];
        exclRngOutUrl = exclWksPass.Range["VI1"].End[Excel.XlDirection.xlToLeft].Offset[0,1];
        exclRngAllPrd = exclWksPass.Range[exclWksPass.Range["A2"], exclWksPass.Range["A1048576"].End[Excel.XlDirection.xlUp]];

        foreach (Excel.Range exclRngEchRow in exclRngAllPrd)
        {
            onupdateUI(exclRngEchRow.Row);
            string strSrchQry, strSupWeb = "";
            strSrchQry = exclRngEchRow.Text ;
            strSupWeb = exclRngEchRow.Offset[0, 2].Text.ToString();
            if(strSupWeb.Length>4)
            {
                strSupWeb = strSupWeb.Substring(strSupWeb.IndexOf("www") + 4);
            }

            WebBrowser webBrwser = new WebBrowser();
            webBrwser.ScriptErrorsSuppressed = true;

            webBrwser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrwser_DocumentCompleted);
            webBrwser.Navigate(strGoglLnk+strSrchQry+"+"+ exclRngEchRow.Offset[0, 1].Text);

            do
            {
                //as using the web forms browser using doevents
                System.Windows.Forms.Application.DoEvents();
            } while (webBrwser.ReadyState != WebBrowserReadyState.Complete);

            strResltUrl = webResltSerch(webBrwser, strSupWeb.ToUpper(), strSrchQry);
            while (strResltUrl == null || (strResltUrl[0].Contains("Part Not Found")))
            {
                strSrchQry = ModifedInput(strSrchQry) ;
                if (strSrchQry.Length < 6) { break; }
                webBrwser.Navigate(strGoglLnk + strSrchQry+ "+" + exclRngEchRow.Offset[0, 1].Text);
                do
                {
                    System.Windows.Forms.Application.DoEvents();
                } while (webBrwser.ReadyState != WebBrowserReadyState.Complete);
                strResltUrl = webResltSerch(webBrwser, strSupWeb.ToUpper(), strSrchQry);

            }//while loop
            exclWksPass.Cells[exclRngEchRow.Row, exclRngOutUrl.Column].Value = strResltUrl[0];
            exclWksPass.Cells[exclRngEchRow.Row, exclRngOutUrl.Column+1].Value = strResltUrl[1];
            exclWksPass.Cells[exclRngEchRow.Row, exclRngOutUrl.Column+2].Value = strResltUrl[2];
            exclWksPass.Cells[exclRngEchRow.Row, exclRngOutUrl.Column + 3].Value = strResltUrl[3];
            webBrwser.Dispose();
            webBrwser = null;
        }

        if (notifyCompleteEvent != null)
        {
            notifyCompleteEvent(this,EventArgs.Empty);
        }
        resumeUI.Set();
    }

    void webBrwser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser crntBrws = sender as WebBrowser;
        if (crntBrws.ReadyState==WebBrowserReadyState.Complete)
        { 
            blnBrwRedy = true;
            System.Diagnostics.Debug.Print("Loaded page " + crntBrws.Url.AbsolutePath); 
        }

    }


    private void onupdateUI(long CrntPrgrs)
    {
        var handler = updateUI;
        if (handler != null)
        {
            handler(this, new NotifyEventArgs(CrntPrgrs));
        }
    }

    public string[] webResltSerch(WebBrowser brwser,string OrigUrl,string OrgPrtnumb)

    {
        //searching the website
    }
}

UI更新后进度条显示完全更新（冻结后返回）时没有问题但窗口是空白的

Answer 1

它仍然冻结的原因是因为你要求用户界面等到ManualResetEvent被设置。

UI线程将停在您的WaitOne()行，直到您设置事件，导致所有内容锁定。

我考虑使用BackgroundWorker代替;支持进度指示，并允许您通过当前正在进行的Excel.Worksheet。如果您需要UI仍然响应，请不要等待UI线程上的Trailtrd线程。

Here's一个带有进度指示的BackgroundWorker的好例子。

Answer 2

您要求您的UI线程通过调用resumeUI.WaitOne();等待新的验证线程完成

当你创建notifyCompleteEvent并且已经注册了它时，你已经有了正确的想法，你所要做的就是删除resumeUI.WaitOne（）调用并在obj_updateUI eventHandler中完成日志记录

<强> ------- EDIT ---------

public void fnStrt(Excel.Worksheet exclWksPass) 
{
    Thread Trailtrd = new Thread(() => fnValidate(exclWksPass));            
    Trailtrd.SetApartmentState(ApartmentState.STA);
    Trailtrd.Name = "classfuncallthread";
    Trailtrd.Start();                  
}

private void btnSubmt_Click(object sender, RoutedEventArgs e)
    {
        ValidateWork obj = new ValidateWork();
        obj.notifyCompleteEvent += new EventHandler(obj_notifyCompleteEvent);
        obj.updateUI += new EventHandler<NotifyEventArgs>(obj_updateUI);

        if (string.IsNullOrEmpty(TxtbxFlePth.Text))
        {
            MessageBox.Show("Please Select a Excel File to Validate");
            return;
        }
        Excel.Application exclCrtApp = new Excel.Application();        
        Excel.Worksheet exclWrkSht = // get the relevant worksheet

        //if you are always working on a single worksheet then just handle it as a data member  other wise add it to notifyCompleteEvent as an argument

    obj.fnStrt(exclWrkSht);

}

现在将调用事件处理程序

void obj_notifyCompleteEvent()
{

  // DO your UI logic here 
  // note no need to use the dispatcher

  //now its time to save 
  string strSaveName = exclWrkBuk.FullName.ToString();
  strSaveName = strSaveName.Substring(0, strSaveName.IndexOf(".xls"));
  exclCrtApp.DisplayAlerts = false;
  exclWrkBuk.SaveAs(strSaveName+"_output.xlsx");
  exclWrkBuk.Close(false);
  exclCrtApp.DisplayAlerts = true;
  exclCrtApp.Quit();
  exclCrtApp = null;


}

使用线程时WPF UI未获得更新

2 个答案: